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flight-manifest-plugin.ts
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flight-manifest-plugin.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import { webpack, sources } from 'next/dist/compiled/webpack/webpack'
import { MIDDLEWARE_FLIGHT_MANIFEST } from '../../../shared/lib/constants'
import { clientComponentRegex } from '../loaders/utils'
// This is the module that will be used to anchor all client references to.
// I.e. it will have all the client files as async deps from this point on.
// We use the Flight client implementation because you can't get to these
// without the client runtime so it's the first time in the loading sequence
// you might want them.
// const clientFileName = require.resolve('../');
type Options = {
dev: boolean
pageExtensions: string[]
isEdgeServer: boolean
}
const PLUGIN_NAME = 'FlightManifestPlugin'
let edgeFlightManifest = {}
let nodeFlightManifest = {}
export class FlightManifestPlugin {
dev: boolean = false
pageExtensions: string[]
isEdgeServer: boolean
constructor(options: Options) {
if (typeof options.dev === 'boolean') {
this.dev = options.dev
}
this.pageExtensions = options.pageExtensions
this.isEdgeServer = options.isEdgeServer
}
apply(compiler: any) {
compiler.hooks.compilation.tap(
PLUGIN_NAME,
(compilation: any, { normalModuleFactory }: any) => {
compilation.dependencyFactories.set(
(webpack as any).dependencies.ModuleDependency,
normalModuleFactory
)
compilation.dependencyTemplates.set(
(webpack as any).dependencies.ModuleDependency,
new (webpack as any).dependencies.NullDependency.Template()
)
}
)
// Only for webpack 5
compiler.hooks.make.tap(PLUGIN_NAME, (compilation: any) => {
compilation.hooks.processAssets.tap(
{
name: PLUGIN_NAME,
// @ts-ignore TODO: Remove ignore when webpack 5 is stable
stage: webpack.Compilation.PROCESS_ASSETS_STAGE_ADDITIONS,
},
(assets: any) => this.createAsset(assets, compilation)
)
})
}
createAsset(assets: any, compilation: any) {
const manifest: any = {}
compilation.chunkGroups.forEach((chunkGroup: any) => {
function recordModule(id: string, _chunk: any, mod: any) {
const resource = mod.resource
// TODO: Hook into deps instead of the target module.
// That way we know by the type of dep whether to include.
// It also resolves conflicts when the same module is in multiple chunks.
if (
!resource ||
!clientComponentRegex.test(resource) ||
!clientComponentRegex.test(id)
) {
return
}
const moduleExports: any = manifest[resource] || {}
const exportsInfo = compilation.moduleGraph.getExportsInfo(mod)
const moduleExportedKeys = ['', '*'].concat(
[...exportsInfo.exports]
.map((exportInfo) => {
if (exportInfo.provided) {
return exportInfo.name
}
return null
})
.filter(Boolean)
)
moduleExportedKeys.forEach((name) => {
if (!moduleExports[name]) {
moduleExports[name] = {
id,
name,
chunks: [],
}
}
})
manifest[resource] = moduleExports
}
chunkGroup.chunks.forEach((chunk: any) => {
const chunkModules =
compilation.chunkGraph.getChunkModulesIterable(chunk)
for (const mod of chunkModules) {
let modId = compilation.chunkGraph.getModuleId(mod)
if (typeof modId !== 'string') continue
// Remove resource queries.
modId = modId.split('?')[0]
// Remove the loader prefix.
modId = modId.split('next-flight-client-loader.js!')[1] || modId
recordModule(modId, chunk, mod)
// If this is a concatenation, register each child to the parent ID.
if (mod.modules) {
mod.modules.forEach((concatenatedMod: any) => {
recordModule(modId, chunk, concatenatedMod)
})
}
}
})
})
// With switchable runtime, we need to emit the manifest files for both
// runtimes.
if (this.isEdgeServer) {
edgeFlightManifest = manifest
} else {
nodeFlightManifest = manifest
}
const mergedManifest = {
...nodeFlightManifest,
...edgeFlightManifest,
}
const file =
(!this.dev && !this.isEdgeServer ? '../' : '') +
MIDDLEWARE_FLIGHT_MANIFEST
const json = JSON.stringify(mergedManifest)
assets[file + '.js'] = new sources.RawSource('self.__RSC_MANIFEST=' + json)
assets[file + '.json'] = new sources.RawSource(json)
}
}